Yes, the package validity for Weekly Facebook Pack will be stacked.For example, if a customer buy Weekly Facebook Pack two times in the same day, they will get 1998
MB and the validity will be 14 days from the first activation date (instead of 7 days)

For any external link via from Facebook, the customer will be charged from data pack first if the customer has any data pack. Otherwise, external data link will be charged as per the standard paygo rate on the
customer’s price plan.

No, VOIP calls through Facebook will be charged from customer’s data pack first if the customer has any data pack. Otherwise it will be charged from customer’s main account balance as per the standard paygo
rate on the customer’s price plan.